LOS ANGELES (AP) _ Volunteers including Bianca Jagger and a specialist in fitting artificial limbs departed Saturday with two planeloads of medical equipment on a mission to aid war and earthquake victims in El Salvador.

Two chartered Boeing 727s carried the 35 volunteers and 30 tons of medical supplies in an airlift sponsored by Medical Aid for El Salvador, a non-profit humanitarian relief organization founded in 1981.

''There is no militaristic solution to the problem in El Salvador. The best answer to the situation there are aid missions like this,'' said Miss Jagger, the Nicaraguan actress and model once married to Rolling Stone singer Mick Jagger.

The $1 million worth of medical supplies includes were primarily collected from Roman Catholic hospitals around the United States, said Sandy Brim, executive director for Medical Aid for El Salvador.

Included in the shipment, along with antibiotics and medicines for malaria and other diseases, are a dozen prosthetic arms and legs for children who lost their limbs in the fighting between government forces and Salvadoran leftist rebels.

David Evans, who lost both his legs in the Vietnam war and is a specialist in fitting the limbs, was among those traveling to El Salvador.

The date for the airlift was chosen to coinicide with the sixth anniversary of the slaying of four American churchwomen in El Salvador.

William Ford of Montclair, N.J., brother of one of the four churchwomen, will accompany the delegation to a special memorial mass on Dec. 2, the anniversary of the slayings.